<template>
  <div id="home">
    <NavBar class="home-nav">
      <div slot="center">购物街</div>
    </NavBar>
    <TabControl
      :titles="['流行', '新款', '精选']"
      ref="tabControl1"
      @tabClick="tabClick"
      class="tab-control"
      v-show="isTabFixed"
    ></TabControl>
    <Scroll
      class="content"
      ref="scroll"
      :probeType="3"
      :pullUpLoad="true"
      @scroll="contentScroll"
      @pullingUp="loadMore"
    >
      <HomeSwiper
        :banners="banners"
        @swiperImageLoad="swiperImageLoad"
      ></HomeSwiper>
      <RecommendView :recommends="recommends"></RecommendView>
      <FeatureView></FeatureView>
      <TabControl
        :titles="['流行', '新款', '精选']"
        ref="tabControl2"
        @tabClick="tabClick"
      ></TabControl>
      <GoodsList :goods="goods[currentType].list"></GoodsList>
    </Scroll>
    <BackTop @click.native="backClick" v-show="isShowBackTop"></BackTop>
  </div>
</template>

<script>
import NavBar from "components/common/navbar/NavBar";
import Scroll from "components/common/scroll/Scroll";
import TabControl from "components/content/tabControl/TabControl";
import GoodsList from "components/content/goods/GoodsList";
import BackTop from "components/content/backTop/BackTop";
import HomeSwiper from "./childComps/HomeSwiper";
import RecommendView from "./childComps/RecommendView";
import FeatureView from "./childComps/FeatureView";
import { getHomeMultidata, getHomeGoods } from "network/home";
import {itemListenerMixin,backTopMixin} from "components/common/mixin"
export default {
  name: "Home",
  components: {
    NavBar,
    Scroll,
    TabControl,
    GoodsList,
    BackTop,
    HomeSwiper,
    RecommendView,
    FeatureView,
  },
  mixins:[itemListenerMixin,backTopMixin],
  data() {
    return {
      banners: [],
      recommends: [],
      goods: {
        pop: { page: 0, list: [] },
        new: { page: 0, list: [] },
        sell: { page: 0, list: [] },
      },
      currentType: "pop",
      tabOffsetTop: 0,
      isTabFixed: false,
      saveY: 0
    };
  },
  activated() {
    this.$refs.scroll.scrollTo(0, this.saveY, 0);
    this.$refs.scroll.refresh();
  },
  deactivated() {
    //1.保存y值
    this.saveY = this.$refs.scroll.getScrollY();
    //2.取消全局事件的监听
    this.$bus.$off("itemImageLoad",this.itemImgListener);
  },
  created() {
    //1.申请多个数据
    this.getHomeMultidata();

    //2.请求商品数据
    this.getHomeGoods("pop");
    this.getHomeGoods("new");
    this.getHomeGoods("sell");
  },
  methods: {
    /**
     * 事件监听相关方法
     */
    tabClick(index) {
      switch (index) {
        case 0:
          this.currentType = "pop";
          break;
        case 1:
          this.currentType = "new";
          break;
        case 2:
          this.currentType = "sell";
          break;
      }
      this.$refs.tabControl1.currentType = index;
      this.$refs.tabControl2.currentType = index;
    },
    contentScroll(position) {
      //1.判断BackTop是否显示
      this.isShowBackTop = -position.y > 800;
      //2.决定tabControl是否吸顶(position:fixed)
      this.isTabFixed = -position.y > this.tabOffsetTop;
    },
    loadMore() {
      this.getHomeGoods(this.currentType);
    },
    swiperImageLoad() {
      this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop;
    },
    /**
     * 网络请求相关方法
     */
    getHomeMultidata() {
      getHomeMultidata().then((res) => {
        this.banners = res.data.banner.list;
        this.recommends = res.data.recommend.list;
      });
    },
    getHomeGoods(type) {
      const page = this.goods[type].page + 1;
      getHomeGoods(type, page).then((res) => {
        this.goods[type].list.push(...res.data.list);
        this.goods[type].page += 1;
        this.$refs.scroll.finishPullUp();
      });
    },
  },
};
</script>

<style scoped>
#home {
  height: 100vh;
  position: relative;
}
.home-nav {
  background-color: var(--color-tint);
  color: #fff;
}
.content {
  overflow: hidden;
  position: absolute;
  top: 44px;
  bottom: 49px;
  left: 0;
  right: 0;
}

.tab-control {
  position: relative;
  z-index: 9;
  background-color: #fff;
}
</style>